Burglar-alarm.



HLAVATY.

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13%),080. Patented June 5, 1917.

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A TTOHNEY J. HLAVATY.

BURGLAR ALARM.

APPLICATION FILED MAR. 9. 19I6..

Patented June 5, 1917.

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UNITED sramns PATENT oFFIon.

JOSEPH I-ILAVATY, OF OKLAHOMA, OKLAHOMA.

BURGLAR-ALARM.

Application filed March 9, 1916.

To all whom it may concern:

Be it known that I, Josnrn: HLAVATY, a citizen of the United States, residing at Oklahoma city, in the county of Oklahoma and State of Oklahoma, have invented certain new and useful Improvements in Burglar-Alarms, of which the following is a specification, reference being had to the accompanying drawings.

An object of the invention is to provide a cheap, simple, and convenient burglar alarm.

In carrying out this object, the inventor has provided improved means whereby the proper person on the outside of the door may render the alarm inoperative and enter the door without giving an alarm.

Other objects and advantages of the illvention will be set forth in the ensuing description.

The accompanying drawings show two embodiments of the invention in. practical form.

Figure 1 is an elevation view of the outside of a door, showing the improved alarm in use thereon. i

Fig. 2 is a similar view of a door which is hinged to its supporting jamb in a man ner different from the door shown in Fig. 1.

Fig. 3 is an enlargedreproduction of that part of Fig. 2 at and around the point indicated by the arrow 3.

Fig. 4 is a sectional view on the same scale as Fig. 3 and on the line H of Fig. 1.

Fig. 5 is a similar view on the line 55 of Fig. 2.

Fig. 6 is a perspective view of the parts shown in Fig. 4, looking a little upward and in the direction of the arrow 6.

Fig. 7 is an elevation view of the parts shown in Fig. 5, taken in the direction of the arrow 7.

Fig. 8 is an elevation view, on still larger scale, of parts shown in Fig. 7, but showing said parts after they have been released for action.

Referring to the several figures, in all of which like characters of reference designate like parts, the improved alarm includes mechanism adapted to hold and fire a cartridge 10.

Specification of Letters Patent.

certain ones of Patented June 5, 1917.

Serial No. 83,031.

This mechanism is composed of a suitable base plate 11 which is adapted to be secured to some suitable part of a door frame, this plate having mounted rigidly on it a barrel 12 through which a firing-pin 13 is slidably fitted.

A coil spring 14: embracing the firingpin 13 is interposed between the upper end 15 of the barrel 12 and a tight collar 16 on the. lower part of said firing-pin, and this spring acts to drive the firing-pin against the cartridge 10 which is held in a lug 17 on the lower part of the plate 11.

In setting the firing-pin l3-for action, it is drawn upward from the position shown in Fig. 8 to the position shown in Fig. 7, a lateral arm 18 on its upper end being caught over one or the other of the pins 19 which are permanently set in the upper end of the plate 11.

It will now be seen that by swinging the arm 18 outward off its supporting pin 19 the firing-pin 13 will be thrust downward by the spring 14 and fire the cartridge 10.

In further, arrangement, means are provided for releasing the firing-pin 13 for action when the door 20 is opened.

This means includes a shaft 21 which extends revolubly through the door 20, this shaft being supported on the outside of the door by a plate 22 which forms a graduated dial, and on plate 23.

The outer end of the shaft 21 is provided with a small knob 24 and an indicator point 25 adapted to register with the graduations of the dial 22.

When the door 20 is hinged to the outer edge of the jamb 26 of the door frame, as shown in Figs. 1 and 4, the firing mechanism shown in Fig. 8 is mounted near the opposite or inner edge of said jamb where the arm 18 of the firing-pin 13, when supported for action by the pin 19, may project almost directly toward the pivotal point ofthe door hinge 27 as shown in said Fig. 4E; and the inner end of the shaft 21 is provided with a tripping disk 28 whose edges are flanged forward as at 29 to trip the arm 18 off the pin 19 and allow the firing-pin 13 to act when the door is opened.

the inside by a 'disk to'the proper place, clears the use of the "knob The inner end of the shaft 21, when used with the parts arranged as shown in Figs. 4: and, 6, is supportedby a tubu'lar'bearing which is an integral inward extension of the plate 23. a

In order that a person'having the'rightto enter the door may do so withouttripping the alarm, the flange 29 of the disk 28 is provided with a gap 31, which, by revolving the the end of the arm 18 of the firing-pin -13 without tripp'ing it, thisgap being set to the right place by 24: and graduated plate 22 m substantially the same manner as a permutation lock is set 1" r opening. v WVhen the door 20 is hinged to the inner edge of the jamb'26, as shown in Figs. 2, 3, 5, and 7, the firing mechanism shown in Fig'LSismounted'on the edge of the door casing 32 wherethe arm 18 ofthe'firing-pin "13,'when supported-by-the'pin 19, may project pastthe pivotal point-0f the door hinge 27 in position tobe tripped by a disk 33 when the door opens."

Like the disk 28, the 'dis'k33 is supported onthe innerendof its shaft 21, but since said disk 33 -is approximately in a ,plane which includes the line of axis of-the-hinge 27 it does not require thefiange 2.9 like the diskQS in ordertotrip the arm 18.

in the arrangementof parts best shown in Fig. 5, the inner end of the shaft 21 is supported by the plate 23 which a is secured to the door 20; I i

one-side of the frame, of

7 ing post projecting 'tion,

clear the arm 18 of Having thus described the invention, I claim In a burglar alarm, the combination with a" frame anda swlnging closure hinged to plunger mounted upon the side of the frame with a lateral arm, a fixed pin overwhich the lateral-arm of the plunger is adapted to be swung to hold the plunger against the action of the spring, alarm ineans adapted to beactuate'd by the plungen a tubular hearfrom the face of the closure at apoint near=the hinged edge thereof, a shaft extending through the closure and'tubu'lar-bearing post, a flanged plate'applied to the shaft atthe endof the tubular bearing post and ofi'set from I the face of the closure so that the flange thereof will have a lateral swinging movementand engage the arm of the plunger when the closure is opened, said flange having a cut-away porand means for 4 rotatingthe :shaft and plate-to bring the cut-away portion of" the flange opp osite the arm of the plunger when it "is desired :to open the closure without sounding the alarm.

Witness n'iy handthis 6 day oflMarch,

V JOSEPH HLAV'ATY. WVitnesses G.'W. BoNsn,

J. J. NovAK.

Copies of =this patent may be obtained. for 'five cents each,'.byiaddressing the Gomruissioner of Patents,

, Washington, 0.

the firing-pin 13 in the same manner as the .flange29' of the disk 28.

a spring actuated V to which the closure is hinged and formed 7 

